glDrawElementsInstancedBaseVertexBaseInstance man page on Oracle
[printable version]
GLDRAWELEMENTSINSTAN(3G) OpenGL Manual GLDRAWELEMENTSINSTAN(3G)
NAME
glDrawElementsInstancedBaseVertexBaseInstance - render multiple
instances of a set of primitives from array data with a per-element
offset
C SPECIFICATION
void glDrawElementsInstancedBaseVertexBaseInstance(GLenum mode,
GLsizei count,
GLenum type,
GLvoid *indices,
GLsizei primcount,
GLint basevertex,
GLuint baseinstance);
PARAMETERS
mode
Specifies what kind of primitives to render. Symbolic constants
GL_POINTS, GL_LINE_STRIP, GL_LINE_LOOP, GL_LINES,
GL_TRIANGLE_STRIP, GL_TRIANGLE_FAN, GL_TRIANGLES,
GL_LINES_ADJACENCY, GL_LINE_STRIP_ADJACENCY,
GL_TRIANGLES_ADJACENCY, GL_TRIANGLE_STRIP_ADJACENCY and GL_PATCHES
are accepted.
count
Specifies the number of elements to be rendered.
type
Specifies the type of the values in indices. Must be one of
GL_UNSIGNED_BYTE, GL_UNSIGNED_SHORT, or GL_UNSIGNED_INT.
indices
Specifies a pointer to the location where the indices are stored.
primcount
Specifies the number of instances of the indexed geometry that
should be drawn.
basevertex
Specifies a constant that should be added to each element of
indices when chosing elements from the enabled vertex arrays.
baseinstance
Specifies the base instance for use in fetching instanced vertex
attributes.
DESCRIPTION
glDrawElementsInstancedBaseVertexBaseInstance behaves identically to
glDrawElementsInstanced() except that the ith element transferred by
the corresponding draw call will be taken from element indices[i] +
basevertex of each enabled array. If the resulting value is larger than
the maximum value representable by type, it is as if the calculation
were upconverted to 32-bit unsigned integers (with wrapping on overflow
conditions). The operation is undefined if the sum would be negative.
The basevertex has no effect on the shader-visible value of
gl_VertexID.
Specific vertex attributes may be classified as instanced through the
use of glVertexAttribDivisor(). Instanced vertex attributes supply
per-instance vertex data to the vertex shader. The index of the vertex
fetched from the enabled instanced vertex attribute arrays is
calculated as gl _ InstanceID divisor + baseInstance. Note that
baseinstance does not affect the shader-visible value of gl_InstanceID.
NOTES
glDrawElementsInstancedBaseVertex is only supported if the GL version
is 3.2 or greater.
.SH "ERRORS"
GL_INVALID_ENUM is generated if mode is not an accepted value.
GL_INVALID_VALUE is generated if count or primcount is negative.
GL_INVALID_OPERATION is generated if a geometry shader is active and
mode is incompatible with the input primitive type of the geometry
shader in the currently installed program object.
GL_INVALID_OPERATION is generated if a non-zero buffer object name is
bound to an enabled array or the element array and the buffer object's
data store is currently mapped.
SEE ALSO
glDrawElements(), glDrawRangeElements(),
glDrawRangeElementsBaseVertex(), glDrawElementsInstanced(),
glDrawElementsInstancedBaseVertex()
COPYRIGHT
Copyright © 2011 Khronos Group. This material may be distributed
subject to the terms and conditions set forth in the Open Publication
License, v 1.0, 8 June 1999. http://opencontent.org/openpub/.
AUTHORS
opengl.org
opengl.org 04/29/2014 GLDRAWELEMENTSINSTAN(3G)
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